How to use this tool
Enter the weight in grams, purity in karats and your own pure-gold price per troy ounce.
Record the price's date or source. The metal estimate excludes dealer spreads, craftsmanship, taxes and fees.
Metal value = grams / 31.1034768 × karats / 24 × entered troy-ounce price
Worked example
$602.83 · estimated metal value
Fixed example using the settings below. Monetary examples use USD; dates and times use their stated reference values. This example stays unchanged when you edit your calculation.
Example inputs
- Weight (grams): 10
- Purity (karats): 18
- Your price per troy ounce of pure gold: 2500
- Price date / source (your reference): User-entered illustrative price; not a live quote
Method illustration: 10 g of 18K contains 7.5 g fine gold, about .24113 troy ounces.
Assumptions and limits
- Price is entered by you in the display currency. No live market price is implied.
- Metal value excludes dealer spread, assay, craftsmanship, fees and taxes. Karat fineness can differ from actual assay.
Check or report a result
Check the units, selected calculation and assumptions first. Compare the fixed example above with your inputs to identify what changed.
Report a calculation issue with the page address, hypothetical inputs, result displayed and result expected. Do not include passwords, bank details or other private information.